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I have a 4 year old Senville Aura mini split heat pump which has stopped heating. It will still cool but when I set thermostat to call for heat the wall unit shows defrost. There are no error codes.

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Its too cold outside to work. Therefore the coil needs to defrost first in order to work.

Posted on Dec 12, 2016

Testimonial: "Thanks for you help.The temperature was actually above 0 degrees Celsius when it quit working."

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Does not work on heat mode...all other modes work.. on heat mode defrost and run lights are on for a few min then flashes F5 for a min then repeats the process.


If I understand you have 120 volts but no 12 volts. Most likely the main 12 volt fuses or switches are bad/blown/off. I would start looking near the house battery and work out from there. Some battery charger/converters have internal fuses that can blow if the battery is hooked up backwards. The 12 volt fuse box usually has a main as well.
Don't forget to look for inline fuse holders and if this is a trailer, look on the tongue for 30 amp breakers near the battery that look like rectangular silver boxes. Some have resets on the ends and others are like fuses.

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Senville mini split heat pump is stuck in defrost mode


Did you find a solution to this? as I now have the same problem???

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Were dose the green wire go to my senville 18000 heat pump indoor unit


The green thermostat wire goes to the G on the terminal strip. If it's not a thermostat wire it is a ground wire Should be grounded to the metal case for safety. It does not affect the operation.

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Senville mini split displays a "defrost" symbol????


It's a heat pump and that is how they work. But it shouldn't be cycling so much unless you live in Minnesota? The colder it is outside the more chance that the outside coil will freeze so it will go into defrost. It may be low on charge or have leak as well. Call a tech to verify.

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I have two senville mini split 18000 and they both frost up with in 1 Hr. of use both have been pumped out and recharged


Dear Friend! Before recharging gas.did you check leak testing? If not, again you will same problem.

And some more reasons for frost up:
1. Indoor coil & air filter dust blocked-clean it. 2.Less rpm of indoor fan motor- replace capacitor or motor.
Thanks, it's helpful to you.

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We just moved into a rental. It has the Fugitsu wall-mounted Air-conditioner model: ar-jw2 but, there was no manual left behind and we are trying to use the heat, however, it just blows cool air, we're not...


Look, if you select a temperature above ambient temperature, it will switch from cooling to heating.(assuming that the aircon has a heat pump. most do these days.) Just dont rush the aircon because every time you make a setting change, it takes a while to regulate.

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Gold Star mini split heat pump 24,000 btu. Changed indooe as we as outdoor boards and still goes in cooling mode only. Reset button on outdoor board calls in heat but not by inside hand set. Len Cabana...


On a heat pump the difference from heat to cool is the reversing valve.
In cooling or heating the Y1 terminal will always be energized, this is the contactor.
Depending on brand the reversing valve will either be energized in Heat or Cool. At the outdoor unit check to see if the reversing valve is getting 24 volts in cool, if not check to see if it is getting 24 volts in heating. The easiest way to check if the reversing valve is shifting, is to feel the big copper tube, (it is not the suction line on a heat pump) this is a refrigerant vapor line. It will be cold in cooling and hot in heating.
Check your thermostat installation instructions and heat pump installation instructions to determine the proper terminal designations for your heat pump and thermostat. There are some brands out there that use the B terminal as common to the 24 volt circuit, so you have to check the wiring and make sure this is not common.
If it is energized in Cool then the Y1 and O terminal will be energized. You will have 24 volts from common usually the C terminal to Y1 and O.
If it’s energized in Heat then the Y1 and B terminal should be energized. You will have 24 volts from common usually the C terminal to Y1 and B.
If you get heat when you’re calling for cooling or vice versa then switch the wire between the B and O terminals.

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How to use thermostat for heat on Fujitsu IAQ halcyon



This unit comes with a remote control (optional wall mounted wired thermostat available) as a standard feature. This unit is precharged with the environment friendly R-410a refrigerant. No additional refrigerant is needed if the line set is 49 feet in lenght or shorter. In addition to its very high 20 SEER efficiency rating, the 15RLQ is only 31 in. long which makes it the smallest Mini-Split System in its category through out the industry.
This category of equipment is ideal for smaller spaces where spot cooling is required. Several models in this category are ENERGY STAR Certified, meaning they save you money on your utility bill. Residential applications including sunrooms and additions are made easier with these air conditioners and heat pumps. Do you have a warm spot in your home? Fujitsu mini-splits can provide extra cooling capacity for those hard to cool areas. Commercially, their small size makes them ideal for small offices, providing individual temperature control.
Fujitsu's I.A.Q. Systems provide residential and commercial property owners an innovative solution for clean, temperature-controlled indoor air. The Halcyon IAQ systems deliver powerful heating and cooling, are designed for ease of use and maintenance, and feature an unobtrusive design which can be integrated easily into any decor. The Halcyon IAQ systems filter dust, pollen and odor making them the perfect addition to any home!
Standard Features system15_18rlq_medium.jpg
  • Wireless Remote Control
  • Plasma Filter
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Warranty All Fujitsu ductless mini-split air conditioners and heat pumps come with a 2 year parts and 6 year compressor warranty.
Important: All installations must be performed or supervised by a certified HVAC technician in order for the warranty to be valid.

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